Session Notes for rd1904 Prepared by K. Le Bail, NVI, Inc./GSFC =========================================================== PURPOSE AND GENERAL NOTES =========================================================== GAIA proposal The Laboratory d'Astrophysique de Bordeaux (LAB) subnmitted in 2012 a proposal to observe 195 ICRF2 transfer sources in the context of the GAIA mission. These sources were added to the GSFC monitoring program and 37 sources were scheduled in Gaia-dedicated R&D sessions. In February 2017, we studied the position uncertainties and the observation frequency of the 195 sources of the LAB proposal. Twenty-seven of these sources have a bad observation frequency: they were observed successfully in less than five sessions a year while the LAB requirement was twelve sessions a year. Most of these sources have bad uncertainties compared to the other sources of the set (larger than 50 microas). Three additional sources have good position uncertainties and an observation frequency of five to eleven successful sessions a year. However they are sources that were observed in previous Gaia-dedicated R&D sessions and the concern is that if they are not scheduled in coming dedicated R&D sessions, their observation frequency may drop. The sources scheduled in the Gaia-dedicated R&D sessions scheduled to observe after March 1st, 2017 are these thirty sources. When compared to the previous categories determined by the LAB, one source was in category 1, five sources were in category 2, five sources were in category 3 and nineteen sources were in category 4. In RD1904, we schedule 24 out of the thirty sources in the astro mode of sked. We use a maxscan value of 600 seconds. We use the sked flux catalog for all sources. The command fill is used with an offset of 10 seconds. We added the source 3C48 to the set of sources in the ASTRO section to monitor its position. We use a modified version of the 1Gbps wide-band mode currently used to schedule AOV sessions. Wettzell and Kokee will observe INT I19128 during the time from 1815 UT to 1945 UT. Wettzell will observe INT W19129 during the time from 0700 UT to 0930 UT. ================================================================ ----- Parameter listing -------------------------------------- Experiment: RD1904 Description R&D-05/2019 Scheduler: NASA Correlator: SHAO Start: 2019-128-17:30:00 End: 2019-129-17:30:00 Current yyyyddd: 2019128 (2019.35) ( 18612 MJD, WED. 8MAY.) Greenwich sidereal time: 08:35:01 (17:30:00 UT) Sun's RA and DEC: 3h 1.5m 17d 8.9 ================================================================ First observations Observation listing from file ./rd1904.skd for experiment RD1904 Source Start DURATIONS name yyddd-hhmmss Ft Hh Ho Kk Ma Ny Sh Wz 0716+714 19128-173000| 43 73 109 78 109 79| 1349-439 19128-173000| 283 283 | 0202+319 19128-173220| 40 182 119 182| 0410+110 19128-173512| 582 582 | 1251-197 19128-173650| 383 502 502 489 502| 1215+303 19128-174630| 238 287 308 282 308| End of listing. ================================================================ Last observations Observation listing from file ./rd1904.skd for experiment RD1904 Source Start DURATIONS name yyddd-hhmmss Ft Hh Ho Kk Ma Ny Sh Wz 0823-223 19129-171713| 132 80 151 151| 1846+322 19129-171810| 102 91 102 43 | 1803+784 19129-172039| 40 40 40 | 0606-223 19129-172101| 68 45 189 189| 2029+024 19129-172356| 224 224 206 | 0805+410 19129-172538| 252 252 252 75 252| 2113+293 19129-172833| 40 40 | 3C446 19129-172915| 35 35 | End of listing. ================================================================ SKED Summary from file ./rd1904.skd for experiment RD1904 (all scans with at least one subnet station) Average number of obs. per baseline per source(normalized by up-time) = 7.4 Min = 0.0 Max = 72.0 (Baseline Sh-Wz on 0528-250) RMS = 8.4 Total time: 1440 minutes ( 24.0 hours). Key: Ft=FORTLEZA Hh=HARTRAO Ho=HOBART26 Kk=KOKEE Ma=MATERA Ny=NYALES20 Sh=SESHAN25 Wz=WETTZELL Ft Hh Ho Kk Ma Ny Sh Wz Avg % obs. time: 46 50 56 62 71 72 61 63 60 % cal. time: 2 2 2 2 2 2 2 2 2 % slew time: 23 37 28 13 18 12 29 7 22 % idle time: 28 10 12 22 8 12 7 26 16 total # scans: 154 182 185 200 190 202 215 186 189 # scans/hour : 6 8 8 8 8 8 9 8 8 Avg scan (sec): 258 236 264 267 321 309 243 295 273 # data tracks: 32 32 32 32 32 32 32 32 # Mk5 tracks: 32 32 32 32 32 32 32 32 Total TB(M5): 5.09 5.49 6.24 6.82 7.81 7.98 6.69 7.02 6.64 # OF OBSERVATIONS BY BASELINE | Ft Hh Ho Kk Ma Ny Sh Wz Total -------------------------------------------------- Ft| 80 20 40 95 67 21 73 396 Hh| 74 0 89 58 61 78 440 Ho| 84 32 33 103 31 377 Kk| 71 116 115 84 510 Ma| 134 93 138 652 Ny| 124 139 671 Sh| 97 614 Wz| 640 Number of 2-station scans: 159 Number of 3-station scans: 117 Number of 4-station scans: 55 Number of 5-station scans: 101 Number of 6-station scans: 20 Number of 7-station scans: 0 Number of 8-station scans: 0 Total number of scans: 452 Total number of obs: 2150 Total integrated obs-time: 580442 Average obs-time: 270.0 Histogram of observation durations Dur: 30 60 90 120 150 180 210 240 270 300 330 360 390 420 450 480 510 540 570 600 #Obs: | 461| 132| 131| 150| 117| 71| 65| 118| 57| 41| 108| 58| 51| 39| 46| 48| 40| 54| 363| Average X-band SNRs by baseline | Ft Hh Ho Kk Ma Ny Sh Wz AVG ------------------------------------------------- Ft| 48 33 33 42 43 57 62 46 Hh| 43 - 51 43 53 68 52 Ho| 33 35 37 54 40 42 Kk| 46 58 55 72 52 Ma| 82 84 126 75 Ny| 94 122 79 Sh| 116 77 Wz| 98 Average S-band SNRs by baseline | Ft Hh Ho Kk Ma Ny Sh Wz AVG ------------------------------------------------- Ft| 29 21 26 21 20 23 27 24 Hh| 33 - 32 28 33 41 33 Ho| 32 24 24 29 25 29 Kk| 31 39 38 46 37 Ma| 30 30 42 31 Ny| 33 41 33 Sh| 39 34 Wz| 39 ================================================================ Recording mode Name Code AOVSX16W SX Recording mode for: FORTLEZA Mode Tot.Rate Tot.BandW #BBC #bits Barrel Mk341:2 1024 Mbits 128 MHz 14 2 NONE Chan.BW #Subpasses Tracks(*fan) Tot.tracks 16.00 MHz 1 16(*2) 32 X-band spanned bw= 720.0 MHz rms spanned bw= 275.0 MHz S-band spanned bw= 88.0 MHz rms spanned bw= 30.9 MHz Effective number of 1-bit channels recorded per sub-pass X S Total 19.13 11.48 30.61 Recording mode for: HARTRAO HOBART26 KOKEE MATERA NYALES20 SESHAN25 WETTZELL Mode Tot.Rate Tot.BandW #BBC #bits Barrel Mk341:1 1024 Mbits 256 MHz 14 2 NONE Chan.BW #Subpasses Tracks(*fan) Tot.tracks 16.00 MHz 1 32(*1) 32 X-band spanned bw= 720.0 MHz rms spanned bw= 275.0 MHz S-band spanned bw= 88.0 MHz rms spanned bw= 30.9 MHz Effective number of 1-bit channels recorded per sub-pass X S Total 19.13 11.48 30.61 ================================================================ Tape types ID Station Tape length Density Passes Ft FORTLEZA Mark5A Hh HARTRAO Mark5B Ho HOBART26 Mark5B Kk KOKEE Mark5B Ma MATERA Mark5B Ny NYALES20 Mark5B Sh SESHAN25 Mark5B Wz WETTZELL Mark5B ================================================================ SNR targets Minimum SNR by baseline for multi-baseline scans X-band (margin 0) S-band (margin 0) X-band (ast_margin 0) S-band (ast_margin 0) Ft Hh Ho Kk Ma Ny Sh Ft Hh Ho Kk Ma Ny Sh Hh 20 Hh 15 Ho 20 20 Ho 15 15 Kk 20 20 20 Kk 15 15 15 Ma 20 20 20 20 Ma 15 15 15 15 Ny 20 20 20 20 20 Ny 15 15 15 15 15 Sh 20 20 20 20 20 20 Sh 15 15 15 15 15 15 Wz 20 20 20 20 20 20 20 Wz 15 15 15 15 15 15 15 ================================================================